Chapter 12, Problem 64A

Interpretation Introduction

Interpretation:

The cubic, monoclinic and hexagonal crystal systems needs to be compared.

Concept introduction:

These are crystal families having different sides and angles.

Answer to Problem 64A

Sides and angles are different in cubic, monoclinic and hexagonal crystals.

Explanation of Solution

In cubic crystal system, all the Sides are of equal length and all angles are $90°$. In monoclinic crystal system, sides $a,b,c$ are unequal in length and angles $\alpha$and ? are $90°$ except the angle $\beta$ which is not $90°$. In hexagonal crystal system, sides a and b are equal but side c is not equal and the angles $\alpha$ and $\beta$ are $90°$ but ? is $120°$

Conclusion

Different angles and sides give different structures.